128461 has 2 divisors, whose sum is σ = 128462. Its totient is φ = 128460.

The previous prime is 128449. The next prime is 128467. The reversal of 128461 is 164821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86436 + 42025 = 294^2 + 205^2 .

It is an emirp because it is prime and its reverse (164821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128461 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64230 + 64231.

It is an arithmetic number, because the mean of its divisors is an integer number (64231).

2¹²⁸⁴⁶¹ is an apocalyptic number.

It is an amenable number.

128461 is a deficient number, since it is larger than the sum of its proper divisors (1).

128461 is an equidigital number, since it uses as much as digits as its factorization.

128461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 22.

The square root of 128461 is about 358.4145644362. The cubic root of 128461 is about 50.4572719651.

The spelling of 128461 in words is "one hundred twenty-eight thousand, four hundred sixty-one".